Season 2, episode 17.
Original air date: 25 December 1951.
Cast: Duncan Renaldo (The Cisco Kid), Leo Carrillo (Pancho), Marsha Jones (Blanche Modell aka Sue Prentiss), Riley Hill (Bill Prentiss), Joe Forte (Prentiss), Doris Merrick (Madame Lil), Denver Pyle (Professor Jerry Roark), Zon Murray (Henchman), Tom Holland (Henchman), Diablo (Cisco`s Horse: uncredited), Herman Hack (Townsman: uncredited), Al Haskell (Townsman: uncredited), Rex Lease (Man buying Book: uncredited), Carl Mathews (Townsman: uncredited), Mathew McCue (Townsman: uncredited) and Bob McElroy (Townsman: uncredited).
Denver Pyle`s TV debut.
From IMDB.